EP0553921B1 - Improved process for producing calcium nitrate-urea adduct - Google Patents

Improved process for producing calcium nitrate-urea adduct Download PDF

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Publication number
EP0553921B1
EP0553921B1 EP93200168A EP93200168A EP0553921B1 EP 0553921 B1 EP0553921 B1 EP 0553921B1 EP 93200168 A EP93200168 A EP 93200168A EP 93200168 A EP93200168 A EP 93200168A EP 0553921 B1 EP0553921 B1 EP 0553921B1
Authority
EP
European Patent Office
Prior art keywords
urea
calcium nitrate
weight
nitrate
urea adduct
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93200168A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0553921A1 (en
Inventor
Antonio Crispoldi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nuova Terni Industrie Chimiche SpA
Original Assignee
Terni Industrie Chimiche SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Terni Industrie Chimiche SpA filed Critical Terni Industrie Chimiche SpA
Publication of EP0553921A1 publication Critical patent/EP0553921A1/en
Application granted granted Critical
Publication of EP0553921B1 publication Critical patent/EP0553921B1/en
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/24—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by shooting or throwing the materials, e.g. after which the materials are subject to impact
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C5/00—Fertilisers containing other nitrates
    • C05C5/005—Post-treatment
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C5/00—Fertilisers containing other nitrates
    • C05C5/04—Fertilisers containing other nitrates containing calcium nitrate
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C9/00—Fertilisers containing urea or urea compounds

Definitions

  • the present invention relates to an improved process for producing calcium nitrate-urea adduct as a granular, free-flowing solid material which has been used in the past, as such, in agriculture, as a nitrogenous fertilizer.
  • the invention also relates to some equipment pieces useable in order to carry out such a process.
  • Calcium nitrate-urea adduct is a per se known compound and is an addition product of calcium nitrate and urea, in which calcium nitrate constitutes 40.6% by weight, and can be defined by means of the formula [Ca(NO 3 ) 2 .4CO(NH 2 ) 2 ].
  • Calcium nitrate-urea adduct potentially is a very interesting compound as a fertilizer, because, additionally to ureic nitrogen, it contains nitric nitrogen, the presence of which makes it possible the typical ammonia losses shown by urea alone, when the latter undergoes the hydrolysis process in the soil, to be avoided.
  • processing calcium nitrate-urea adduct through crystallization, prilling and rotary-tray granulation does not make it possible a granular, free-flowing product with no tendency to release dusts, to be obtained.
  • the product which can be obtained in that way contains an excess of urea over to the required urea amount in order to form the adduct, and also characterized by the undesirable characteristic of low values of granules hardness.
  • the resulting calcium nitrate-urea adduct is in the form of a granular solid material and can be used in agriculture as a nitrogen containing fertilizer.
  • the present invention aims to provide an improved process for producing calcium nitrate-urea adduct, which makes it possible that a perfectly granular and free-flowing product is being obtained which is absolutely homogeneous as regards the mechanical characteristics of the various particles.
  • the present invention concerns a process for producing calcium-nitrate urea as a granular free flowing solid, which process comprises the following steps:
  • a liquid composition is prepared at a temperature not higher than 170°C, which contains urea and calcium nitrate in a mutual molar ratio equal, or approximately equal, to 4 : 1, and containing a water content of up to 18% by weight.
  • calcium nitrate can be used as a dried powder, or as a concentrated aqueous suspension containing a water content of up to values of the order of 15 - 18% by weight.
  • the calcium nitrate used may contain ammonium nitrate as an impurity, up to levels of the order of 5 - 6% by weight.
  • Urea used in the preparation of such a composition normally shows a purity of the order of 97% by weight or more, and may contain biuret as an impurity, in an amount of up to approximately 1.2% by weight.
  • the solution obtained from the preliminary mixing step [(a) step] is sent, at a temperature comprised within the range of from 120 to 170°C, to a particular turbodryer [(b) step], with, in that way, anhydrous, molten calcium nitrate-urea adduct at the temperature of 150-200°C being directly obtained at the outlet.
  • the turbodryer is basically constituted by a cylindrical shell heated from the outside with closed-loop circulated diathermic oil.
  • Said oil is kept at its operating temperature by heating by means of a heating unit.
  • a shaft which is equipped with a plurality of paddles and is kept revolving at a revolution speed preferably of round 400 g/minute. Said paddles perform the task of distributing the entering solution along the walls of the cylindrical chamber, so as to realize a thin-film concentration.
  • Said equipment may operate either in the presence or in the absence of a flowing stream of hot air.
  • the resulting molten salt is sent, through a suitable pump, to a fluidized-bed granulator drum.
  • the granulator can be constituted by a cylindrical drum revolving a round its own axis at a revolution speed which is comprised within the range of from 8 to 12 revolution per minute, which cylindrical drum is equipped with longitudinal baffles integral with the internal surface of the same cylindrical drum.
  • the fluidized bed is positioned, and under it there is the beam which supports the spraying nozzles.
  • the baffles perform the task of moving the calcium nitrate-urea adduct granules towards the high side of the drum, so that they may then be caused to fall back into the cooling fluidized bed; during the subsequent falling of the salt from the fluidized bed towards the bottom of the drum, a curtain is formed onto which calcium nitrate-urea adduct sprayed by the nozzles impinges.
  • the fluidized bed is fed, from its interior, with room air heated at a temperature comprised within the range of from 60 to 120°C: it performs the purpose of removing the melting heat of the granules which are being formed.
  • the temperature at the outlet from the granulator is comprised within the range of from 80 to 115°C.
  • the product is then sent to the sieving and recycle system. Also a step of post-drying of the so separated granules can be added, in order to reach optimal hardness values. Also the use of a hardening agent can be provided for.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Fertilizers (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Thiazole And Isothizaole Compounds (AREA)
  • Heat Treatment Of Steel (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Coloring Foods And Improving Nutritive Qualities (AREA)
  • Saccharide Compounds (AREA)
EP93200168A 1992-01-27 1993-01-23 Improved process for producing calcium nitrate-urea adduct Expired - Lifetime EP0553921B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI920134A IT1262932B (it) 1992-01-27 1992-01-27 Procedimento migliorato per la produzione di calcourea
ITMI920134 1992-06-01

Publications (2)

Publication Number Publication Date
EP0553921A1 EP0553921A1 (en) 1993-08-04
EP0553921B1 true EP0553921B1 (en) 1996-10-30

Family

ID=11361666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93200168A Expired - Lifetime EP0553921B1 (en) 1992-01-27 1993-01-23 Improved process for producing calcium nitrate-urea adduct

Country Status (10)

Country Link
US (1) US5716591A (it)
EP (1) EP0553921B1 (it)
JP (1) JPH05339086A (it)
AT (1) ATE144760T1 (it)
DE (1) DE69305661T2 (it)
DK (1) DK0553921T3 (it)
ES (1) ES2093910T3 (it)
FI (1) FI104067B1 (it)
IT (1) IT1262932B (it)
NO (1) NO304225B1 (it)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5917110A (en) * 1996-10-18 1999-06-29 Tetra Technologies, Inc. Moisture-resistant calcium containing particles
DE102004005907B4 (de) * 2004-02-05 2006-01-05 Uhde Gmbh Anlage zur Herstellung von biuretarmem harnstoffhaltigem Düngemittelgranulat
JP4799136B2 (ja) * 2005-11-14 2011-10-26 日本化薬株式会社 ガス発生剤組成物
JP5325099B2 (ja) * 2007-05-02 2013-10-23 日本化薬株式会社 ガス発生剤組成物及びガス発生剤組成物成形体、並びにそれに用いる化合物の製造方法、並びにガス発生器
WO2008139557A1 (ja) * 2007-05-02 2008-11-20 Nipponkayaku Kabushikikaisha ガス発生剤組成物及びガス発生剤組成物成形体、並びにそれに用いる化合物の製造方法、並びにガス発生器
NO341345B1 (no) 2012-08-29 2017-10-16 Yara Int Asa Fremgangsmåte for å begrense anvendelsen av et ammoniumnitratgjødsel som forløper for et eksplosiv og sammensetning for dette
US11299441B2 (en) 2017-07-21 2022-04-12 Sabic Global Technologies B.V. Calcium sulfate urea granules and methods for producing and using the same
CN111491907A (zh) * 2017-08-21 2020-08-04 理海大学 生产尿素加合物的无溶剂方法
CN108083877A (zh) * 2017-12-20 2018-05-29 贵州芭田生态工程有限公司 一种以冷冻法硝酸磷肥工艺副产的硝酸钙为原料生产尿素硝酸钙的方法
CN113260600A (zh) 2018-12-07 2021-08-13 沙特基础工业全球技术公司 包含硫酸钙尿素的肥料及其制备和使用方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH431576A (de) * 1964-01-07 1967-03-15 Inventa Ag Verfahren zum Granulieren von stickstoffhaltigen Düngemitteln
US4091544A (en) * 1977-02-11 1978-05-30 The Procter & Gamble Company Drying process
US4497757A (en) * 1983-01-31 1985-02-05 The Procter & Gamble Company Energy efficient hydration process
CH663273A5 (en) * 1984-12-18 1987-11-30 Fershan Holding S A Method of continuous drying of a powdered substance and apparatus for implementing it
FR2585971A1 (fr) * 1985-08-07 1987-02-13 Kaltenbach Thuring Sa Dispositif et installation de granulation
IE57463B1 (en) * 1985-08-07 1992-11-04 Kaltenbach Thuring Sa Granulating device
IT1216890B (it) * 1987-02-13 1990-03-14 Palermo Enichem Agricoltura S Procedimento per la produzione di calcourea.

Also Published As

Publication number Publication date
US5716591A (en) 1998-02-10
ITMI920134A1 (it) 1993-07-27
ATE144760T1 (de) 1996-11-15
JPH05339086A (ja) 1993-12-21
FI104067B (fi) 1999-11-15
DK0553921T3 (da) 1997-03-17
FI930308A (fi) 1993-07-28
EP0553921A1 (en) 1993-08-04
NO930241L (no) 1993-07-28
ITMI920134A0 (it) 1992-01-27
NO930241D0 (no) 1993-01-25
FI104067B1 (fi) 1999-11-15
NO304225B1 (no) 1998-11-16
DE69305661D1 (de) 1996-12-05
ES2093910T3 (es) 1997-01-01
FI930308A0 (fi) 1993-01-26
IT1262932B (it) 1996-07-22
DE69305661T2 (de) 1997-04-30

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